A few years ago, I tried bashing a couple of fantasy locos in N. Below is a "poor man's" Baldwin centipede!

It's two spliced Atlas FM C-Liner shells riding on a Japanese EF-57 chassis. It worked fairly well. I have anothe fantasy loco somewhere I'll have to dig up for a photo.
EDIT: OK, I found the other. I call it a "super C-Liner" and while it's N scale, it does fit your topic! The loco was bashed from two Atlas C-Liner dummies from the late 60's - 70's. I had a bunch of them so it was fun playing around and seeing what I could come up with. BTW, the B&A didn't own ANY FM C-liners so it's double fantasy!
Dick